wow, where to start with you.....
unfortunately you made so many mistakes in starting your tank that its to late to correct alot of them.
1) you overstocked the tank greatly. 10 fish is entirely to many for a 55 gallon. i would say 6 or 7 is the max you could put in there and thats with super pairings of very different fish.
2) it sounds like you put the fish in much to quickly. you should have waited about 2 weeks between adding fish. my guess is you added them all within a month. the reason you do this is for the very reason you are looking for help. disease. you must understand that when you buy fish you are bringing them into a closed evironment where disease may or may not have ever been seen. it sounds like your fish stressed from over crowding and thus the ich set in.
3) if at all possible never treat your main tank. i know funds are limited but a simple quarantine tank can be set up for 30 dollars. ich from what ive been hearing cannot be very well treated with chems. hyposalinity seems to be a proven way to treat it and the method of doing it can be found in the disease forum. im not very well versed on diseases so i can't help you much more beyond what i just said.
4) garlic will help PREVENT ich not cure it. but it will not hurt to feed it to your fish at this point if you have some.
5) just slow down.
always ask questions before doing anything. there are entirely to many variables to this hobby as i hope i have just illustrated. it looks like you got some bad advice in running your tank or noone bothered to help you out properly. sorry but you are in good hands here.